A quantitative analysis of hydraulic interaction processes in stream-aquifer systems.
A quantitative analysis of hydraulic interaction processes in stream-aquifer systems.
复制标题
河流含水层系统水力相互作用过程的定量分析
DOI：
10.1038/srep19876
复制
发表时间：
2016-01-28
影响因子：
4.6
通讯作者：
Zhu L
中科院分区：
文献类型：
--
作者：
Wang W;Dai Z;Zhao Y;Li J;Duan L;Wang Z;Zhu L
当抽水速率超过河床最大渗流通量时，河流与含水层的水力关系由水力连接变为水力断开。本研究旨在定量分析河流-含水层系统从连接到断开的物理过程。采用自由地下水位方程来阐明在什么条件下溪流开始从含水层水力分离。理论分析和室内试验均表明，当自由水面水平水力梯度为0，垂直水力梯度为1时，河流-含水层系统的水力连通性达到临界断连状态。建立了解析解下倒立地下水位运动的断口临界点运动的边值问题。结果表明：倒立水位的最大距离或厚度等于河流的水深，在稳定的断流状态下，河床中心的最大水力梯度为2。该研究有助于了解河流附近水流的水力现象，准确评价地表水和地下水资源。
The hydraulic relationship between the stream and aquifer can be altered from hydraulic connection to disconnection when the pumping rate exceeds the maximum seepage flux of the streambed. This study proposes to quantitatively analyze the physical processes of stream-aquifer systems from connection to disconnection. A free water table equation is adopted to clarify under what conditions a stream starts to separate hydraulically from an aquifer. Both the theoretical analysis and laboratory tests have demonstrated that the hydraulic connectedness of the stream-aquifer system can reach a critical disconnection state when the horizontal hydraulic gradient at the free water surface is equal to zero and the vertical is equal to 1. A boundary-value problem for movement of the critical point of disconnection is established for an analytical solution of the inverted water table movement beneath the stream. The result indicates that the maximum distance or thickness of the inverted water table is equal to the water depth in the stream, and at a steady state of disconnection, the maximum hydraulic gradient at the streambed center is 2. This study helps us to understand the hydraulic phenomena of water flow near streams and accurately assess surface water and groundwater resources.